package com.mmall.service.Impl;

import com.mmall.common.Const;
import com.mmall.common.ServerResponse;
import com.mmall.common.TokenCache;
import com.mmall.dao.UserMapper;
import com.mmall.pojo.User;
import com.mmall.service.IUserService;
import com.mmall.util.MD5Util;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;
import java.util.UUID;

/**
 * @Author 侯俊杰
 * @Date 2017/10/11
 * @Time 20:38
 **/
@Service("iUserService")
public class UserServiceImpl implements IUserService
{
    @Autowired
    private UserMapper userMapper;

    @Override
    public ServerResponse<User> login(String username, String password)
     {
        int resultCount = userMapper.checkUsername(username);
        if(resultCount == 0)
        {
            return ServerResponse.createByErrorMessage("用户名不存在");
        }

        String md5Password = MD5Util.MD5EncodeUtf8(password);

        User user = userMapper.selectLogin(username,md5Password);
        if(user==null)
        {
            return ServerResponse.createByErrorMessage("密码错误");
        }

        user.setPassword(org.apache.commons.lang3.StringUtils.EMPTY);//防止json序列化的时候把密码也显示了……
        return ServerResponse.createBySuccess("登录成功",user);
    }

    public ServerResponse<String> register(User user)
    {
        ServerResponse validResponse = this.checkValid(user.getUsername() , Const.USERNAME);
        if(!validResponse.isSuccess())
        {
            return validResponse;
        }

        validResponse = this.checkValid(user.getEmail() , Const.EMAIL);
        if(!validResponse.isSuccess())
        {
            return validResponse;
        }

        user.setRole(Const.Role.ROLE_CUSTOMER);

        //MD5加密
        user.setPassword(MD5Util.MD5EncodeUtf8(user.getPassword()));

        int resultCount = userMapper.insert(user);
        if(resultCount == 0) return ServerResponse.createByErrorMessage("注册失败");
        return ServerResponse.createBySuccessMessage("注册成功");
    }

    public ServerResponse<String> checkValid(String str , String type)
    {
        if(org.apache.commons.lang3.StringUtils.isNotBlank(type))
        {
            //开始校验
            if(Const.USERNAME.equals(type))
            {
                int resultCount = userMapper.checkUsername(str);
                if(resultCount > 0)
                {
                    return ServerResponse.createByErrorMessage("用户名已存在");
                }
            }
            if(Const.EMAIL.equals(type))
            {
                int resultCount = userMapper.checkEmail(str);
                if(resultCount > 0)
                {
                    return ServerResponse.createByErrorMessage("Email已存在");
                }
            }
        }
        else
        {
            return ServerResponse.createByErrorMessage("参数错误");
        }
        return ServerResponse.createBySuccessMessage("校验成功");
    }

    public ServerResponse<String> selectQuestion(String username)
    {
        ServerResponse validResponse = this.checkValid(username,Const.USERNAME);
        if(validResponse.isSuccess())
        //用户不存在
        {
            return ServerResponse.createByErrorMessage("用户不存在");
        }

        String question = userMapper.selectQuestionByUsername(username);
        if(org.apache.commons.lang3.StringUtils.isNotBlank(question))
        {
            return ServerResponse.createBySuccess(question);
        }
        return ServerResponse.createByErrorMessage("找回密码的问题是空的");
    }

    public ServerResponse<String> checkAnswer(String username,String question , String answer)
    {
        int resultCount = userMapper.checkAnswer(username,question,answer);
        if(resultCount>0)
        {
            //说明问题及问题答案是这个用户的，并且是正确的
            String forgetToken = UUID.randomUUID().toString();
            //UUID我们可以称之为一个宇宙无敌不可（超级微小概率）重复的字符串
            TokenCache.setKey(TokenCache.TOKEN_PREFIX+username,forgetToken);
            return ServerResponse.createBySuccess(forgetToken);
        }
        return ServerResponse.createByErrorMessage("问题的答案错误");
    }

    public ServerResponse<String> forgetResetPassword(String username,String passwordNew , String forgetToken)
    {
        if(StringUtils.isBlank(forgetToken))
        {
            return ServerResponse.createBySuccessMessage("参数错误,token需要传递");
        }

        ServerResponse validResponse = this.checkValid(username,Const.USERNAME);
        if(validResponse.isSuccess())
        //用户不存在
        {
            return ServerResponse.createByErrorMessage("用户不存在");
        }

        String token = TokenCache.getKey(TokenCache.TOKEN_PREFIX+username);

        if(StringUtils.isBlank(token))
        {
            return ServerResponse.createByErrorMessage("token无效或过期");
        }

        if(StringUtils.equals(forgetToken,token))
        {
            String md5Password = MD5Util.MD5EncodeUtf8(passwordNew);
            int rowCount = userMapper.updatePasswordByUsername(username,md5Password);

            if(rowCount>0) return ServerResponse.createBySuccessMessage("修改密码成功");
        }else
        {
            return ServerResponse.createByErrorMessage("token错误，请重新获取重置密码的token");
        }

        return ServerResponse.createByErrorMessage("修改密码失败");
    }
    public ServerResponse<String> resetPassword(String passwordOld , String passwordNew,User user)
    {
        //防止横向越权，要校验一下这个用户的旧密码，一定要指定是这个用户，因为我们会查询一个count(1)出来，如果不指定id，
        // 那么查出来的结果很有可能是true，count>0
        int resultCount = userMapper.checkPassword(MD5Util.MD5EncodeUtf8(passwordOld),user.getId());
        if(resultCount == 0)
        {
            return ServerResponse.createByErrorMessage("旧密码错误");
        }

        user.setPassword(MD5Util.MD5EncodeUtf8(passwordNew));
        int updateCount = userMapper.updateByPrimaryKeySelective(user);

        if(updateCount > 0)
        {
            return ServerResponse.createBySuccessMessage("密码更新成功");
        }
        return ServerResponse.createByErrorMessage("密码更新失败");
    }

    public ServerResponse<User> updateInformation( User user)
    {
        //username是不能被更新的
        //email也要进行一个校验,校验新的email是不是已经存在，并且存在的email如果相同的话，不能是当前我们这个用户的
        int resultCount = userMapper.checkEmailByUserId(user.getEmail(),user.getId());
        if(resultCount > 0)
        {
            return ServerResponse.createByErrorMessage("email已经存在，请更换email再尝试更新");
        }

        //新建一个User是为了updateByPrimaryKeySelective不更新多余字段，减轻服务器负担
        User updateUser = new User();
        updateUser.setId(user.getId());
        updateUser.setUsername(user.getUsername());
        updateUser.setEmail(user.getEmail());
        updateUser.setPhone(user.getPhone());
        updateUser.setQuestion(user.getQuestion());
        updateUser.setAnswer(user.getAnswer());

        int updateCount = userMapper.updateByPrimaryKeySelective(updateUser);
        if(updateCount>0)
        {
            return ServerResponse.createBySuccess("更新个人信息成功",updateUser);
        }
        return ServerResponse.createByErrorMessage("更新个人信息失败");
    }
    public ServerResponse<User> getInformation(Integer userId)
    {
        User user = userMapper.selectByPrimaryKey(userId);
        if(user == null)
        {
            return ServerResponse.createByErrorMessage("找不到当前用户");
        }
        user.setPassword(StringUtils.EMPTY);
        return ServerResponse.createBySuccess(user);
    }

    /**
     * 校验是否是管理员
     * @param user
     * @return
     */
    //backend
    public ServerResponse checkAdminRole(User user)
    {
        if(user!=null && user.getRole().intValue() == Const.Role.ROLE_ADMIN)
        {
            return ServerResponse.createBySuccess();
        }
        return ServerResponse.createByError();
    }




}
